81056801 has 8 divisors (see below), whose sum is σ = 94019520. Its totient is φ = 68439888.

The previous prime is 81056797. The next prime is 81056813. The reversal of 81056801 is 10865018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81056801 - 2² = 81056797 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81056851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85946 + ... + 86883.

It is an arithmetic number, because the mean of its divisors is an integer number (11752440).

Almost surely, 2^81056801 is an apocalyptic number.

It is an amenable number.

81056801 is a deficient number, since it is larger than the sum of its proper divisors (12962719).

81056801 is a wasteful number, since it uses less digits than its factorization.

81056801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172903.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 81056801 is about 9003.1550580894. The cubic root of 81056801 is about 432.7759847667.

The spelling of 81056801 in words is "eighty-one million, fifty-six thousand, eight hundred one".